[39417] in North American Network Operators' Group
Re: High speed access
daemon@ATHENA.MIT.EDU (Chris Adams)
Fri Jul 6 10:45:04 2001
Date: Fri, 6 Jul 2001 09:44:33 -0500
From: Chris Adams <cmadams@hiwaay.net>
To: nanog@merit.edu
Message-ID: <20010706094433.F9536@HiWAAY.net>
Mail-Followup-To: Chris Adams <cmadams@hiwaay.net>, nanog@merit.edu
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20010706095319.A14675@noc.untraceable.net>; from twofsonet@graffiti.com on Fri, Jul 06, 2001 at 09:53:19AM -0400
Errors-To: owner-nanog-outgoing@merit.edu
Once upon a time, Andrew Brown <twofsonet@graffiti.com> said:
> symetric 11 Mbps sounds...goofy. especially if based on 802.11b,
> which utilizes a broadcast mechanism. besides, i've yet to meet
> *anyone* who got past about 2/3 of the theoretical "bandwidth" of
> 802.11b. imho, it's the spinal tap of the networking era (it "goes to
> 11", but is actually just a rumor and sort of made up).
802.11b is 11Mbps (at the top end), but that includes signalling
overhead. There is a lot of overhead involved in the protocol (think
like ATM where you can't get 11Mbps of IP traffic through an 11Mbps ATM
link).
Also, 802.11b is "half-duplex"; only one side can be transmitting at a
time (like plain old Ethernet with either 10Base2 or 10BaseT and a dumb
hub).
--
Chris Adams <cmadams@hiwaay.net>
Systems and Network Administrator - HiWAAY Internet Services
I don't speak for anybody but myself - that's enough trouble.
